Fix doc tests; Add from impls for Identifier

src/abstract_tree/identifier.rs

@@ -86,6 +86,18 @@ impl Format for Identifier {
     }
 }
 
+impl From<String> for Identifier {
+    fn from(value: String) -> Self {
+        Identifier::from_raw_parts(Arc::new(value))
+    }
+}
+
+impl From<&str> for Identifier {
+    fn from(value: &str) -> Self {
+        Identifier::new(value)
+    }
+}
+
 impl Display for Identifier {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         write!(f, "{}", self.0)

src/context.rs

@@ -12,7 +12,7 @@
 //! let context = Context::new();
 //!
 //! context.set_value(
-//!     "foobar".to_string(),
+//!     "foobar".into(),
 //!     Value::String("FOOBAR".to_string())
 //! ).unwrap();
 //!
@@ -84,7 +84,7 @@ impl Context {
     /// let second_context = Context::new();
     ///
     /// second_context.set_value(
-    /// "Foo".to_string(),
+    ///     "Foo".into(),
     ///     Value::String("Bar".to_string())
     /// );
     ///